From 96510ce86ade991a7dc968587c3c618cc9bf5a88 Mon Sep 17 00:00:00 2001
From: Pieter Noordhuis <pcnoordhuis@gmail.com>
Date: Thu, 7 Oct 2010 17:48:03 +0200
Subject: Factor out reusable include for libevent

---
 libevent-example.c | 88 ++++++++----------------------------------------------
 1 file changed, 12 insertions(+), 76 deletions(-)

(limited to 'libevent-example.c')

diff --git a/libevent-example.c b/libevent-example.c
index d9c8784..e605af2 100644
--- a/libevent-example.c
+++ b/libevent-example.c
@@ -1,96 +1,32 @@
 #include <stdio.h>
 #include <stdlib.h>
-#include <event.h>
 #include <string.h>
-#include "hiredis.h"
+#include <hiredis/libevent.h>
 
-#define NOT_USED(x) ((void)x)
+void getCallback(redisContext *c, redisReply *reply, const void *privdata) {
+    printf("argv[%s]: %s\n", (const char*)privdata, reply->reply);
 
-/* This struct enables us to pass both the event and the
- * redisContext to the read and write handlers. */
-typedef struct redisEvents {
-    redisContext *context;
-    struct event rev, wev;
-} redisEvents;
-
-void redisLibEventRead(int fd, short event, void *arg) {
-    NOT_USED(fd); NOT_USED(event);
-    redisEvents *e = arg;
-
-    /* Always re-schedule read events */
-    event_add(&e->rev,NULL);
-
-    if (redisBufferRead(e->context) == REDIS_ERR) {
-        /* Handle error. */
-        printf("Read error: %s\n", e->context->error);
-    } else {
-        /* Check replies. */
-        redisProcessCallbacks(e->context);
-    }
-}
-
-void redisLibEventWrite(int fd, short event, void *arg) {
-    NOT_USED(fd); NOT_USED(event);
-    redisEvents *e = arg;
-    int done = 0;
-
-    if (redisBufferWrite(e->context, &done) == REDIS_ERR) {
-        /* Handle error */
-        printf("Write error: %s\n", e->context->error);
-    } else {
-        /* Schedule write event again when writing is not done. */
-        if (!done) {
-            event_add(&e->wev,NULL);
-        } else {
-            event_add(&e->rev,NULL);
-        }
-    }
+    /* Disconnect after receiving the reply to GET */
+    redisDisconnect(c);
 }
 
-/* Schedule to be notified on a write event, so the outgoing buffer
- * can be flushed to the socket. */
-void redisLibEventOnWrite(redisContext *c, void *privdata) {
-    NOT_USED(c);
-    redisEvents *e = privdata;
-    event_add(&e->wev,NULL);
-}
-
-/* Free the redisEvents struct when the context is free'd. */
-void redisLibEventOnFree(redisContext *c, void *privdata) {
-    NOT_USED(c);
-    redisEvents *e = privdata;
-    free(e);
-}
+void errorCallback(redisContext *c) {
+    printf("Error: %s\n", c->error);
 
-redisContext *redisLibEventConnect(const char *ip, int port) {
-    redisEvents *e = malloc(sizeof(*e));
-    e->context = redisConnectNonBlock(ip, port, NULL);
-    redisSetCommandCallback(e->context, redisLibEventOnWrite, e);
-    redisSetFreeCallback(e->context, redisLibEventOnFree, e);
-    event_set(&e->rev, e->context->fd, EV_READ, redisLibEventRead, e);
-    event_set(&e->wev, e->context->fd, EV_WRITE, redisLibEventWrite, e);
-    return e->context;
-}
-
-void getCallback(redisContext *c, redisReply *reply, void *privdata) {
-    NOT_USED(c); NOT_USED(privdata);
-    printf("argv[end-1]: %s\n", reply->reply);
+    /* Clean up the context when there was an error */
     redisFree(c);
-    exit(0);
 }
 
 int main (int argc, char **argv) {
     signal(SIGPIPE, SIG_IGN);
     event_init();
 
-    redisContext *c = redisLibEventConnect("127.0.0.1", 6379);
-    if (c->error != NULL) {
-        printf("Connection error: %s\n", c->error);
-        return 1;
-    }
+    redisContext *c = redisLibEventConnect("127.0.0.1", 6379, errorCallback);
+    if (c == NULL) return 1;
 
     redisCommand(c, "SET key %b", argv[argc-1], strlen(argv[argc-1]));
-    redisCommandWithCallback(c, getCallback, NULL, "GET key");
+    redisCommandWithCallback(c, getCallback, "end-1", "GET key");
     event_dispatch();
+    redisFree(c);
     return 0;
 }
-- 
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